Question : What is the value of a? If 15 + 18 ÷ 3 × 5 – 12 ÷ 4 + a = 100
Option 1: 54
Option 2: 58
Option 3: 48
Option 4: 42
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Correct Answer: 58
Solution : $15+18 \div 3 \times 5-12 \div 4+a=100$ ⇒ $15+6 \times 5-3+a=100$ ⇒ $15+30-3+a=100$ ⇒ $42+a=100$ $\therefore a=58$ hence, the correct answer is 58.
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